This is a great little piece of equipment. Not only is it easy to use, it will: 1. Give you a pressure reading even if the tire etc. has more pressure than the current reading.2. I've never seen a better connection to a tire valve stem. My experience has been that air will leak out when trying to connect to the valve stem and if you have trouble you can lose a lot of pressure. I pressed the shaft and only got a brief puff of air when I clicked the lever. I gave 5 stars for accuracy. I haven't attempted to test this as I've used many gauges and tire inflation pumps and they are lying around everywhere. I strive for consistency. I reserve the right to change this item if it doesn't work before I believe it should be necessary.